安徽宁国大坞尖钨矿床成矿流体及成矿物质来源——来自氢、氧和硫同位素证据

发布时间：2018-04-06 02:19

本文选题：地球化学　切入点：稳定同位素　出处：《矿床地质》2017年02期

【摘要】：大坞尖钨矿床位于扬子陆块南缘与华夏古陆块的接合部位,是皖南地区典型的层控矽卡岩型矿床,近年来在该区域内钨多金属矿的找矿取得很大的突破。成矿流体及成矿物质来源的确定对矿床成因研究、找矿方向及区域成矿规律认识具有重要意义。文章对主成矿期的石英和黄铁矿进行了氢、氧和硫同位素测试。数据显示,主成矿期石英的流体包裹体中水的δD_(SMOW)值为-98.2‰~-70.1‰,δ18O_(SMOW)值为11.5‰~13.9‰之间,成矿流体主要来自岩浆水,有大气降水的混合;黄铁矿的δ34SV-CDT值为4.6‰~5.2‰,硫源单一,主要为岩浆来源,可能有少量地层S混入。矿床氢、氧和硫稳定同位素研究表明,燕山期大钨尖地区大规模的构造-岩浆活动不仅带来了大量的成矿物质,而且使地层中的成矿物质活化迁移,并在有利的构造部位沉淀富集,从而形成钨多金属矿床。
[Abstract]:The Dawujian tungsten deposit is a typical stratabound skarn deposit in the southern margin of the Yangtze block and the Huaxia paleocontinent block, and has made a great breakthrough in the prospecting of tungsten polymetallic deposits in this area in recent years.The determination of ore-forming fluid and source of ore-forming material is of great significance to the study of ore genesis, the direction of prospecting and the understanding of regional metallogenic law.Hydrogen, oxygen and sulfur isotopes of quartz and pyrite during the main metallogenic period were measured.It is mainly a magma source, and there may be a small amount of S-mixed strata.The study of stable isotopes of hydrogen, oxygen and sulfur in the deposit shows that the large-scale tectonic-magmatic activities in the Dayungsten area of Yanshanian period not only brought a great deal of ore-forming materials, but also made the ore-forming materials active and migrated in the strata.And the deposit is enriched in favorable tectonic position, thus forming tungsten polymetallic deposit.
【作者单位】：安徽省地质调查院;合肥工业大学;
【基金】：安徽省地质矿产勘查局项目(编号:DK2013-11)的资助
【分类号】：P597;P618.67

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